Liquid Ejecting Head Compliance Film Adhesion Prevention
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Solution Overview
Problem
Ink jet type recording heads face operational failures due to adhesion of the compliance portion to the cap member, caused by bending during manufacturing or dew condensation, which prevents the compliance portion from functioning effectively.
Innovation Solution
A liquid ejecting head design that includes a manifold with a compliance portion made of flexible film, a fixing plate, and a cap member, where a protrusion portion is provided to regulate adhesion between the film and the cap member, allowing for separate positioning and preventing hindrance to bending deformation, thus ensuring the compliance portion can absorb pressure fluctuations without adhering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the film is adhered to another member (cap member) due to dew condensation or adhesive viscidity recovery under high-temperature/high-humidity conditions, then adhesion occurs between the compliance portion and cap member, but this prevents the compliance portion from functioning (bending deformation is restricted)
Solution Approach 1:
A protrusion portion is introduced as an intermediary element positioned between the film (compliance portion) and the cap member. This protrusion portion acts as a physical barrier that prevents direct contact and adhesion between the film and cap member, while still allowing the film to perform its compliance function through bending deformation. The protrusion portion mediates the spatial relationship between the film and cap member to eliminate harmful adhesion.
Solution Approach 2:
The space between the compliance portion and cap member is segmented by the protrusion portion, which divides the continuous space into separated regions. This segmentation prevents the film from making continuous contact with the cap member across the entire interface, thereby preventing adhesion while maintaining the compliance function in the non-segmented areas.
2Reliability
If the protrusion portion is fixed to the fixing plate, then the protrusion portion is continuous with the opening of the fixing plate, but this hinders bending deformation of the compliance portion when pressure changes to negative pressure
Solution Approach 1:
The protrusion portion is designed as a separate, non-continuous element rather than being fixed to or continuous with the fixing plate opening. This segmentation allows the film to bend freely in the regions not occupied by the protrusion portion, maintaining compliance function while still providing adhesion prevention where the protrusion portion is present.
Solution Approach 2:
The protrusion portion is strategically positioned and sized to provide localized adhesion prevention only where needed, rather than completely restricting film movement. This local intervention allows the majority of the film to maintain its bending deformation capability while specific areas are protected from adhesion to the cap member.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents operational failures by ensuring the compliance portion does not adhere to the cap member, allowing it to function correctly and maintain ink discharge functionality.
Implementation Method 1
the bonding of the film is performed using an adhesive, and thus there is a possibility that viscidity of the adhesive may be recovered under a high-temperature/high-humidity condition. Therefore, there is a problem in that the film is adhered to another member (the cap member) by the adhesive
Implementation Method 2
a compliance portion which constitutes a part of the manifold and is constituted by a film having flexibility, and thus pressure fluctuation of liquid in the manifold is absorbed by deforming the film
Implementation Method 3
even in a case where the adhesive is not applied to a part of the film, which constitutes the compliance portion, when the film is adhered to another member (the cap member) due to dew condensation or the like, an adhesion force by a surface tension increases in accordance with an area
Data Source
AI summary
Provided is a liquid ejecting head that includes a manifold which communicates with a plurality of nozzle openings through which liquid is ejected, a compliance portion which constitutes a part of the manifold and is constituted by a film having flexibility, a fixing plate which is fixed to a surface side of the film, which is a side opposite to the manifold, and has an opening formed in an area which constitutes the compliance portion, and a cap member which is fixed to a surface side of the fixing plate, which is a side opposite to the compliance portion, and covers the opening, in which a protrusion portion which regulates adhering of the film to the cap member is provided, in a state where the protrusion portion is not fixed to the fixing plate, in a space formed in a portion between the compliance portion and the cap member.